Well, I am a little south of you in Central Indiana. I sowed in pots on the picnic table. I sowed cauliflower and a dab of broccoli on June 17th for a mid July plant out. I also sowed the later broccoli about 4 days ago in pots. for late July plant out. My varieties are full season ones...not 50 day wonders [after plant out]. Next I plan to plant butterhead lettuce and spinach in pots about the 26 of July. Also snap peas in the ground then. I also will plant lettuce and spinach in the ground in early August.

Now, I am thinking of planting a second crop, but am not sure when to do it. Check with your state's Extension Service. Each county should have it's own Cooperative Extension Office which provides free publications and information for the asking. They will have valuable vegetable/gardening tables available specifically for your area determined by universities and horticultural research scientists who have collected data from growing those crops in your state. Your tax dollars are already paying for this service so you may as well get some use out of it. Vegetable Planting and Planning Calendar for Missouri (download the pdf) complete with spring and fall planting dates (underneath the spring planting dates for appropriate crops), how much to plant per person, etc. They can also tell you the average last frost date for your area and ideal planting times for specific crops and varieties in your area. See how detailed this example is:

PM2 - A ways back you asked about where to get spun bond row cover. Johnny's carries it in two weights, one for summer mainly to keep insects off, though I have used it for fall frost protection stretched over hoops of black plumbing pipe, this year allowing me to harvest peppers and cherry tomatoes until 2 weeks ago. I've never harvested warm weather crops into November, and I've been gardening in this town for 34 years. The other is specifically for winter protection and is a heavier weight. Where you are, with a combination of plastic sheets or bubble wrap and spun bond on hoops over rows, I imagine that you can harvest until the first heavy snow. My redbor kale is still out in the garden totally unprotected, and it's fine even though the temperatures have been down to 20 degrees the last two nights. It is deep purple and ruffled, gorgeous to the point that one of my neighbors stopped to ask what it is. (During the summer it was more blue-purple, and while attractive enough that I plant one in a container of ornamentals each year, didn't stand out as much as now in an empty garden). I mostly eat it as I am out working in the garden - a grab and go salad - since DH isn't fond of cabbage family veggies. I grow kale, broccoli and edible podded peas since I love them, but don't grow many crops just for myself. I have in past years started spinach in the fall for early spring greens, and as with Defrost, it works well. I am warmer in the fall than she is, but I think colder in the spring - I am a slight bit further south but in a river valley so get late spring frosts. The spinach was fine, and under a row cover might start up earlier. When we had raised beds with weeping soaker hoses at a previous house, each bed had its own separate line that we could switch on. It was a while ago, but as I remember, it watered evenly and was easy to use. Thanks to all who contributed to the directions on herbs that work well in salt and proportions. Someone gave me some rosemary salt, and it's been lovely on popcorn, so I've been meaning to look up how to do it. I haven't spent a lot of time on this forum, though I have been growing organic veggies since I was in my teens. The recent posts listing in the sidebar has pulled me over here recently. Thanks to all for such great information!

I realized as soon as I'd posted that, despite how nice and cool it may be now, it could turn in a heartbeat, so best to wait until most chances of real heat have passed. And, as you say, better selection in nurseries then, too. Thanks to you both for responding.:>)